Revert "git-cache: Start collecting metrics."
Revert "git-cache: Start collecting metrics."

This reverts commit a84eaf515f9dd4f199425e0cfc46f3e1b2b0984a.

Reason for revert:
Should not print notice.
https://logs.chromium.org/logs/infra-internal/buildbucket/cr-buildbucket.appspot.com/8848034039500209104/+/u/bot_update/stdout

Original change's description:
> git-cache: Start collecting metrics.
>
> Change-Id: I36f4b37a78ad23d615e3f49f158e8de785d5214a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2875855
> Reviewed-by: Gavin Mak <gavinmak@google.com>
> Commit-Queue: Edward Lesmes <d05609f027dc667cc37492b1dc1bdea5d60fa82a@chromium.org>

Change-Id: I5d73cfccbcfc75ec26c7ba7127c1320002224e47
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2876069
Auto-Submit: Edward Lesmes <d05609f027dc667cc37492b1dc1bdea5d60fa82a@chromium.org>
Commit-Queue: Rubber Stamper <d516c4cc2192058ab8dae3d306acbdaf2ce6574f@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <d516c4cc2192058ab8dae3d306acbdaf2ce6574f@appspot.gserviceaccount.com>

CoherentLabs/depot_tools,CoherentLabs/depot_tools